Melles Griot 13 AMP 003 User manual

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IilEUESblm

LargeDynamicRange

IilELLES

GSDi

Amplifier

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Large Dynamic Range

Amplifier

AMP

003

Operator's

Manual

Melles Griot Eiectro-OpticsDivision

4665 Nautilus Court South

Boulder, Colorado, USA

Phone (303)581-0337, FAX (303) 581-9060

Preliminary Manual Version A

November 1993

Document 9028-98001

OCopyright

1993

MellesGriot.

rights reserved

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Table

Contents

-1 LARGE DYNAMIC RANGE AMPLIFIER OPERATION GUIDE

..........

1.1 General Description

................................

1.2 Front Panel Controls

Inputs

......................

1.2.1 RANGE Switch

..................................

1.2.2 Offset Adjustment

.............................

1.2.3 Signal Input

..................................

1.2.4 Monitor Output

................................

1.3 Front Panel Digital Readout

........................

1.3.1 Annunciators

..................................

...............................

1.3.2 Numeric Readout 3

..................................

1.4 Rear Panel Inputs 3

..........................

1.4.1 External Power Input 3

.......................

1.4.2 Case Ground Banana Jack 3

.............................

1.5 Rechargeable Batteries 4

.......................

1.5.1 Charging considerations 4

1.5.2 Replacing batteries

...........................

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LARGE DYNAMIC RANGE AMPLIFIER OPERATION GUIDE

1.1

General Description

The Large Dynamic Range Detector Current Amplifier is

compact, general purpose battery operated amplifier intended

for use with photoconductive and photovoltaic detectors that

require the lltransimpedancewconfiguration. The unit converts

current signals from a detector to a voltage while maintaining

a constant zero bias across the detector independent of the

signal. Nine gain settings from

gigohm to

ohms permit

processing of signals from as low as

picoamp to 100

milliamps. The unit has a

112

digit DVM that provides

direct readout of the amplifier in addition to range setting

and battery status. Other features include offset adjustment

to null background readings, a BNC signal monitor for utility

purposes and a rear panel banana jack connection to case

ground. Replaceable

AP.

size NiCad batteries provide a minimum

hours of portable operation. The amplifier may also be

operated from a wall mounted plug-in power supply while

simultaneously charging the batteries.

1.2

Front Panel Controls

Inputs

1.2.1

RANGE Switch

The

RANGE

switch allows selection of maximum full scale

input current of either polarity in nine ranges. The input

current ranges are arranged in descending orders of

magnitude from the counter clockwise position towards the

clockwise stop. Note that the scale is also 'grouped' into

mA,

uA,

and

bands. While the unit is fairly tolerant of

overrange conditions, it is best to begin measurements with

the

RANGE

switch set on the '100 mA1 scale to start with in

order to avoid possible damage to the transimpedance

amplifier inputs when initial input current magnitudes are

unknown.

1.2.2

Offset Adjustment

This adjustment is intended to serve as a 'background null1

adjustment. It will provide full scale offsets of either

polarity from the

nA range through the

range

inclusive. Offset adjustment capabilities are also provided

for both the

and

100

ranges, but are limited to

approx.

for both ranges. In order to 'zero' the

instrument to obtain accurate readings of input currents,

turn the unit on and adjust the control. Note that the

Offset Adjustment maintains a percentase of full scale value

between the ranges when adjusted

i.e. if the Offset

9028-98001

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Adjustment is set to 5.74 uA with the

RANGE

switch on the 20

u~ position, selecting the 2

position will result in .574

of offset current (plus or minus

1%))

and switching to

the 200 uA position will change the relative offset to 57.4

uA of offset current.

1.2.3 Signal Input

This BNC connector accepts the input current to the unit.

The outer barrel is connected to the amplifier circuit

ground (and the case of the unit); the center is connected

to the input of the transimpedance amplifier and is a

'virtual ground8. Bias voltage at this input is a function

of the amplifier used in the transimpedance configuration,

and is typically 0.3 mV.

1.2.4 Monitor Output

The Monitor Out BNC provides an analog voltage output where

(plus or minus) two volts represents

output of

the range selected. For example, if the

RANGE

switch is on

the "20

uAw

position, 1.999 volts represents 19.99 microamps

of current; if the

RANGE

switch is on the "2 mAI8 position

1.999 volts would represent 1.999 milliamps of current. The

output is intended to serve as a method of connecting to an

oscilloscope or similar monitor in order to observe A.C. as

well as D.C. characteristics of the input current. Note

that under most circumstances, this output will operate

without clipping to about 2.5 volts (the LCD display will

overrange at 2 volts).

1.3 Front Panel Digital Readout

1.3.1 Annunciators

The LCD readout will display "mA" in the lower right hand

corner when gain resistors 101, lo2, and lo3 are selected,

"uAgtwhen gain resistors lo4, lo5, and lo6 are selected, and

will extinguish when

"nAw

(gain resistors 107,

108,

and 109)

is selected. In addition, the decimal points will switch as

appropriate through the ranges to indicate g81.234m,m12.341g,

and "123.4" as appropriate to the full scale range selected.

In addition to the above annunciators, a "LO BATg8

annunciator will appear in the upper left hand corner of the

display whenever one or both of the battery packs has

discharged to 25% or less of their useful capacity. When

this happens, the displayed value as well as analog output

may no longer be accurate. The unit's accuracy may be

9028-98001

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restored by plugging in the external AC power source at that

time. See section

1.5.1

for more information regarding

this.

1.3.2

Numeric Readout

The numeric readout displays the actual value of the input

current (the D.C. voltage at the Monitor Output divided by

the gain resistor selected). The LCD display itself is

basically a

1/2

digit self-contained Digital Panel Meter.

Since the display circuitry only updates readings about

times per second, the displayed value is not an accurate

reflection of any A.C. components of the input current.

Instead, the reading reflects the D.C. component of the

input current plus (or minus!) the averaae of any A.C.

component. It is recommended that an oscilloscope or

similar instrument be used in conjunction with the Detector

Current Amplifier if A.C. considerations are important to

the measurements being taken.

1.4

Rear Panel Inputs

1.4.1

External Power Input

A nlstandardw

(.080

tip) receptacle is provided on the rear

panel to plug the A.C. wall-mounted power source into in

order to recharge the battery packs and/or run the

instrument from A.C. power. Either

U.S.

or European power

sources are provided with the instrument, depending on the

model ordered. The input power source to the Amplifier

MUST

be A.C. If a D.C. source is plugged into the unit within

the voltage ratings given

(12

volts), the unit may

appear to operate properly, but will eventually fail. It is

reassuring to note, however, that no permanent damage to the

unit should occur if this does happen.

1.4.2

Case Ground Banana Jack

The A.C. supply mentioned in section

1.4.1

"floatsw

...

i.e.

it is NOT earth grounded. If an earth ground is desired,

the llCASEGND" banana jack may be used, which will apply an

earth ground to the case (as well as circuitry ground) of

the Amplifier. The unit was designed this way to allow

flexibility in grounding arrangements.

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1.5

Rechargeable Batteries

1.5.1

Charging considerations

The

NiCad batteries provided with the unit will initially

provide more than

hours of use. Over time, all NiCad

batteries will lose capacity to store a charge, and

eventually the batteries will need to be replaced. The

batteries shipped with each Amplifier unit are considered

"neww (they have been tested through one or two complete

chargeldischarge cycles).

The amount of time required to completely charge the battery

packs will vary with the amount of charge remaining in each

pack when a charge is initiated. If the batteries are

completely "flatn, this will require

hours. It is

recommended that the batteries be allowed occasionally to

become fully discharged

this helps extend the shelf life

of the cells.

When the I1LO BATw indicator appears on the LCD display of

the Amplifier, one or both battery packs have less than

25%

of their useful capacity remaining. At this point, the A.C.

adaptor may be plugged into the back of the unit to recharge

the packs. The

wit

mav be used while rec-ina

Leave the charger plugged in for

hours: whether the unit

is turned on or not is not important. Immediately upon

plugging the A.C. source into the unit, the "LO BATTn

annunciator should disappear, indicating that the circuitry

has enough voltage to maintain accuracy. The A.C. adaptor

may be used continuously, if desired, even when the

batteries are fully charged. Note, however, that there will

be an increase in the input referred noise levels, due to

increased noise levels on the circuitry power caused by the

voltage regulators used in the unit.

It is possible to use the Amplifier with input currents

exceeding

100

for brief periods. ("Briefw is relative to

the amount of input current in excess of

100

and the

condition/charge of the battery packs.) Should the output

current capability of the charger be exceeded, and the

battery pack(s) be low, the

"LO

BATTM annunciator will again

appear on the display.

visible.

the

Wcated reauauvnot be accw.

. .

1.5.2

Replacing batteries aeable

NiC-.

with any other battery-operated product, doing so can result

9028-98001

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in damage to the unit, especially when the charger is

plugged in (alkaline batteries can leak or even explode if

subjected to a "chargingw).

In order to replace batteries, remove the four corner screws

securing the rear panel of the Amplifier to the case and

slide the rear panel and printed circuit board straight out

of the unit noting which 'slot1the board is located in for

replacement. If it becomes necessary to unplug the

connector from the printed circuit board, note the

orientation of the connector before removing it. All

batteries are installed with the

W-U

end contacting the

spring in each holder.

9028-98001

Rev

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Artisan Technology Group is your source for quality

new and certied-used/pre-owned equipment

• FAST SHIPPING AND

DELIVERY

• TENS OF THOUSANDS OF

IN-STOCK ITEMS

• EQUIPMENT DEMOS

• HUNDREDS OF

MANUFACTURERS

SUPPORTED

• LEASING/MONTHLY

RENTALS

• ITAR CERTIFIED

SECURE ASSET SOLUTIONS

SERVICE CENTER REPAIRS

Experienced engineers and technicians on staff

at our full-service, in-house repair center

WE BUY USED EQUIPMENT

Sell your excess, underutilized, and idle used equipment

We also offer credit for buy-backs and trade-ins

www.artisantg.com/WeBuyEquipment

REMOTE INSPECTION

Remotely inspect equipment before purchasing with

our interactive website at www.instraview.com

LOOKING FOR MORE INFORMATION?

Visit us on the web at www.artisantg.com for more

information on price quotations, drivers, technical

specications, manuals, and documentation

View

Instra

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