SpectraDynamics PD5-RM-B User manual
SPECTRADYNAMICS, INC.
Pulse Distribution Amplifier
PD5-RM-B
OPERATING MANUAL
SPECTRADYNAMICS, INC •1849 Cherry St. Unit 2 •Louisville, CO 80027
Phone: (303) 665-1852 •Fax: (303) 604-6088
www.spectradynamics.com
SDI
Copyright © SpectraDynamics, Inc. 2005 2
The PD5-RM-B is a TTL pulse distribution amplifier that accepts one input and
provides five outputs. The outputs are designed to drive low impedance loads and long
50 or 75-ohm cables. The propagation delay through the amplifier is typically 10 ns.
The channel-to-channel delay differences are less than 1 ns. The small propagation
delay characteristics and low temperature coefficient of delay are essential for the
distribution of high quality timing signals. The instrument is available in a 1.72” X 19” X
14“ rack mountable enclosure.
Copyright © SpectraDynamics, Inc. 2005 3
CAUTION!
Voltages capable of causing injury or death are present in this instrument. Use extreme
caution whenever the instrument cover is removed.
Line Voltage
This instrument has been setup to operate on 100 to 120 VAC and a line frequency of
50 to 60 Hz. The unit can be converted to operate on a line voltage of 220 to 240 VAC.
Fuse
A 0.5 Ampere 250V slow-blow fuse is used for 100 – 120 VAC operation.
Only replace fuses with the same type and specifications.
Line Cord
The instrument has a detachable, three wire power cord for connection to a grounded
power source. The enclosure of the unit is directly connected to the outlet ground to
protect against electrical shock. Always use an outlet with a protective ground and do
not disable this safety mechanism.
Service
Do not attempt to service or adjust the instrument unless another person, capable of
providing first aid or resuscitation, is present. Contact SDI for any questions or repairs.
Operation
To operate the unit, locate the AC power entry connector on the rear panel and connect
the power cable. When power is applied to the unit, a red led located on the front panel,
labeled “AC Power”, should light up.
Safety and Preparation for Use
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Copyright © SpectraDynamics, Inc. 2005 4
AC Power
The led is on when power is applied to unit and the unit is operating properly.
DC Power LED
The LED is on when DC power is applied to unit and the unit is operating
properly.
1PPS LED
The LED will flash on the falling edge of the 1 PPS output signal.
The Front Panel
SDI
The Front Panel
SDI
Copyright © SpectraDynamics, Inc. 2005 5
AC POWER ENTRY MODULE
The PD5-RM-B is configured to operate on 100 to 120 VAC.
1 PPS Input
Pulse input. The input signal should conform to TTL levels.
Outputs
Distribution amplifier output. The outputs are designed to drive 50 ohm cables.
The outputs provide a 2 volt peak-to peak signal into a 50 ohm load.
The Back Panel
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Copyright © SpectraDynamics, Inc. 2005 6
Description
The battery backup module allows the PD5-RM-B instrument to be powered by a 24
VDC power source in case of loss of the main AC power. The switch from AC to DC
supply operation is effected by a schottky diode network and charge storage capacitors
to ensure glitch free operation. The +24 VDC power source connector is located on the
back panel of the instrument. The +24 VDC ground is not connected to the instrument
case ground internally, however both ground connections are available at the DC power
connector and may be connected together at this point.
DC Voltage
The + 24 VDC may be used as backup power to prevent loss of signal during power
outages. The DC power supply should be able to provide 24VDC at 2A. For optimum
performance the following specifications should be used for the power supply.
DC Supply 24 VDC, 2 A
Line regulation +/- 0.05% for a 10% line change
Load regulation +/- 0.05% for a 50% load change
Output ripple < 5mV peak to peak
DC Fuse 2A Slow blow
Fuse
A 2.0 Ampere 250V slow-blow fuse is used for +24 VDC operation.
Replace fuses with the same type and specifications.
Service
Do not attempt to service or adjust the instrument unless another person, capable of
providing first aid or resuscitation, is present. Contact SDI for any questions or repairs.
Operation
To operate the unit, locate the AC power entry connector on the rear panel and connect
the power cable. When power is applied to the unit, a red led located on the front panel,
labeled “on”, should light up. Connection of the +24 VDC supply is optional. If the +24
VDC supply is connected a red led on the front panel labeled DC Power connector will
turn on.
Battery Backup Module
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Copyright © SpectraDynamics, Inc. 2005 7
WARNING! DO NOT APPLY AC VOLTAGE TO THIS UNIT THROUGH THE 6 PIN
CONNECTOR ON THE REAR OF THE UNIT! Failure to follow these directions will
cause injury or death to personnel, cause irreparable damage to the instrument
and void all warranties.
WARNING! DO NOT REVERSE THE POLARITY OF THE SUPPLY VOLTAGE!
Reversing the polarity of the power supply will cause damage to the unit and void
all warranties.
WARNING! The chassis of the instrument is internally connected to DC ground.
The front +24VDC connector is wired as follows:
Pin 1 +V (Internal supply voltage for monitoring purpose do not use !)
Pin 2 GND (Internal supply voltage for monitoring purpose do not use !)
Pin 3 -V (Internal supply voltage for monitoring purpose do not use !)
Pin 4 24VDC GND return
Pin 5 +24VDC power
Pin 6 Chassis GND /Earth GND
DC Connector
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Copyright © SpectraDynamics, Inc. 2005 8
To operate the unit, locate the power entry module on the rear of the enclosure.
Make sure that the line voltage selection is correct and connect the power cord. Plug
the unit into an appropriate power outlet. A red LED on the front panel will turn on.
Attach a cable with the signal to be distributed to the rear panel connector labeled 1
PPS Input. A red LED on the front panel will flash on the falling edge of each output
pulse.
Although the device was designed to distribute precision one pulse per second
signals, it may be used to distribute pulses up to a frequency of 100 MHz. The
propagation delay is under 12 ns, and the channel-to-channel delay difference is less
than 1 ns.
Operation
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Copyright © SpectraDynamics, Inc. 2005 9
The rise and fall times were tested with a TTL input signal at 100 kHz.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Rise time 10 - 90 % - 3 4 ns
Fall time 10 - 90 % - 3 4 ns
Propagation delay 50 ohm load - 10 12 ns
Differential delay Channel - Channel 200 500 ps
Impedance input
output
50
10
Ohms
Input High Level
Input Low Level
Input signal into 50 ohm load
Input signal into 50 ohm load
2
-0.7
-
-
5
0.8
V
Output High Level
Output Low Level
50 ohm load
50 ohm load
2
-
2.4
0.4
-
0.5
V
Temperature-delay
Coefficient
0 - 50 ºC
25 - 35 ºC
3
3
5 ps/ºC
Specifications
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Copyright © SpectraDynamics, Inc. 2005 10
The PD5-RM-B is warranted to be free of defects under normal operating
conditions, as specified, for one year from date of original shipment from
SpectraDynamics, Inc (SDI). SDI’s obligation and liability under this warranty is
expressly limited to repairing or replacing, at SDI’s option, any product not meeting the
said specifications. This warranty shall be in effect for one (1) year from the date an
PD5-RM-B is sold by SDI. SDI makes no other warranty, express or implied, and
makes no warranty of the fitness for any particular purpose. SDI’s obligation under this
warranty shall not include any transportation charges or costs of installation or any
liability for direct, indirect, or consequential damages or delay. Any improper use,
operation beyond capacity, substitution of parts not approved by SDI, or any alteration
or repair by others in such manner as in SDI’s reasonable judgement affects the product
materially and adversely shall void this warranty. No employee or representative of SDI
is authorized to change this warranty in any way or grant any other warranty.
SDI
Warranty
SDI
SPECTRADYNAMICS,INC •1849 Cherry Street, Unit 2 •Louisville, CO 80027 •Phone: (303) 665-1852 •Fax: (303) 604-6088
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