SPECTRADYNAMICS, INC
PD-15RMi-C
PULSE DISTRIBUTION AMPLIFIER
OPERATING MANUAL
SPECTRADYNAMICS, INC • 1849 Cherry St. Unit 2. • Louisville, CO 80027
Phone: (303) 665-1852 • Fax: (303) 604-6088
www.spectradynamics.com
PD-15RMi-C Pulse Distribution Amplifier Operating Manual
Copyright © 2016 SpectraDynamics, Inc. All rights reserved.
PD-15RMi-C R01-2016/LA
Contents
1.0 Description …………………………………………………………………….... 1
2.0 Safety and preparation for use ………………………………..……….…….. 2
2.1 Electrical ……………….…………………………………………….……. 2
2.2 Instrument ……..…………….………………………………….….…….. 3
3.0 Front panel description …….…………………………………………….…… 4
4.0 Back panel description ………………………………………………….……. 5
5.0 Installation ………………………………………………………………………. 6
6.0 Operation ……………………………………………………………………… 7
7.0 Troubleshooting ………………………………………………………………. 8
8.0 Specifications …………………………………………………………………. 9
9.0 Warranty and service ………………………………………………………… 10
1.0 Description
The PD-15RMi-C is a TTL Pulse Distribution Amplifier that provides distribution for 1 PPS
signals.
The PD-15RMi-C has three inputs which drive three distribution modules. Each module
supplies five buffered outputs designed to drive low impedance loads and long 50 or 75
ohm cables. The outputs provide a 3.7 volt peak-to-peak signal into a 50 ohm load. The
channel-to-channel delay differences are typically 100 ps. The distribution modules have
typically 3 ps/ºC temperature coefficient of propagation delay that is essential for the
distribution of high quality timing signals.
This instrument is designed to be powered by a 100 to 240 VAC mains source or by a
+12 to +36 VDC power source. If both AC and DC sources are powering the instrument,
the DC source will be used as backup power in case of AC power outages. The
instrument is designed to automatically switch from AC to DC supply operation using a
Schottky diode network and charge storage capacitors to avoid any glitches and ensure
uninterrupted continuous operation.
Pulse Distribution Options:
Product Name Number of
inputs
PD-15RMi-A 1 5 1U, 19” Full rack enclosure
PD-15RMi-C1 1 10 1U, 19” Full rack enclosure
PD-15RMi-C2 2 10 1U, 19” Full rack enclosure
PD-15RMi-C3 1 15 1U, 19” Full rack enclosure
Number of
outputs
Description
SMA connectors on back panel
DC24 battery backup module
SMA connectors on back panel
DC24 battery backup module
SMA connectors on back panel
DC24 battery backup module
SMA connectors on back panel
DC24 battery backup module
OPTIONAL
DC Operation
√
√
√
√
Page 1
2.1 Electrical Safety and Preparation for Use
Voltages capable of causing injury or death are present in this instrument.
Use extreme caution whenever the instrument cover is removed. This instrument
was designed for indoor use only.
Line Voltage
This instrument is designed to operate with a 100 to 240 VAC, 47 to 63 Hz power source.
DC operation with +12 to +36 VDC, + 2 Amperes is also possible.
Fuse
A 1.0 Ampere 250V slow-blow fuse is used for 100-240 VAC operation.
A 2.5 Ampere 250V slow-blow fuse is used for +12 to +36 VDC operation.
Only replace fuses with the same type and specifications.
AC Power
The instrument has a detachable three wire power cord for connection to a grounded AC
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. Detaching the AC power cord is the only option of disconnecting
the unit from the AC mains supply. Make sure you have access to the rear panel or provide
an external accessible AC disconnect means for your PD-15RMi-C.
DC Power
If the instrument was acquired with the DC power module, the DC connector on the back
panel has the following configuration:
Pin 1 NC
Pin 2 NC
Pin 3 NC
Pin 4 +12 to +36 VDC power return
Pin 5 +12 to +36 VDC power
Pin 6 Chassis GND /Earth GND
Verify that the connector from your DC power supply has the pin configuration mentioned
above. Do not apply AC voltage to the DC power connector. Failure to do so may cause
injury or death to personnel, cause damage to the instrument and void all warranties.
Please note that the power return (pin 4) is NOT connected to the instrument case ground
internally, however both ground connections pin 4) and pin 6) are available at the DC
power connector and may be connected together at this point.
Page 2
2.2 Instrument Safety and Preparation for Use
1 PPS Signals
The 1 PPS signals to be distributed should conform to TTL specifications. Make sure you
Only apply TTL level (0 to 5V) signals to the 1PPS INPUT Connector. Do not apply negative voltages as they will damage the pulse distribution amplifier.
Absolute Maximum Ratings
Voltage at 1 PPS input -0.7 VDC to +5.5 VDC
Reverse Voltage at 1 PPS output -0.7 VDC to +5.5 VDC
DC Supply Voltage + 36 VDC
Storage Temperature -10 to +75 ºC
Operation Environment 0 to +50 ºC
Page 3
3.0 Front Panel
AC Power
The AC Power LED turns on when AC power is applied to unit.
DC Power
The DC Power LED is on when DC power is applied to unit.
PPS 1
The PPS LED will flash on the falling edge of the 1PPS output signal from the first pulse
distribution module.
PPS 2
The PPS LED will flash on the falling edge of the 1PPS output signal from the second
pulse distribution module.
PPS 3
The PPS LED will flash on the falling edge of the 1PPS output signal from the third pulse
distribution module.
Page 4
4.0 Back Panel
AC POWER
The PD-15RMi-C is configured to operate on 100 to 240 VAC.
DC POWER
This instrument may also operate on DC power from +12 to +36 VDC as the main power
supply. When the PD-15RMi-C is set up to operate with both AC and DC power sources
at the same time the DC power source is used as backup power in case of AC power
outages.
INPUT
Provide a 1 PPS signal to be distributed to the connector label INPUT. The input signal
should conform to TTL levels.
OUTPUTS
The pulse distribution module outputs are designed to drive a 50-ohm load. Five buff-
ered copies of the input signals are distributed per module.
Page 5
5.0 Installation
Connecting power
The PD-15RMi-C ships with a standard North American or European IEC power cord. The
instrument may be mounted in a standard 19-inch instrument rack or may be operated on
a laboratory bench.
Locate the AC POWER entry module on the rear of the enclosure and connect the power
cord. You may also connect a DC connector on the rear panel with the pin configuration
mentioned on page 2.
Page 6
6.0 Operation
Plug the AC power cord into an appropriate outlet, you may also connect an appropriate
DC power supply to the DC power connector.
Once AC power is supplied to the PD-15RMi-C, the LED on the front panel labeled AC
POWER will turn on. If you also applied DC voltage, the monitor LED labeled DC POWER
will light up.
1 PPS Signal Distribution
Attach an SMA cable with the signal to be distributed to any of the connectors label INPUT
on the front panel. The PPS LED on the front panel of the corresponding module will flash
on the falling edge of each output pulse and five buffered outputs will be available at the
front panel SMA connectors labeled OUTPUTS.
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 are typically 100 ps.
Page 7
7.0 Troubleshooting
Do not attempt to service or adjust the instrument unless another person, capable of
providing first aid or resuscitation, is present. If there are problems that cannot be resolved
by the troubleshooting steps below please contact technical support.
Technical Support
Tel: +1 (303) 665-1852 , Fax: +1 (303) 604-6088
support@spectradynamics.com, www.spectradynamics.com
AC Power LED does not turn on.
Disconnect the power cord and remove the top cover. Check the main AC power fuse and
power cord. If the fuse is blown replace with same type and rating. Please contact SDI if
the fuse blows again or if the event that caused the fuse to blow is not known.
DC Power LED does not turn on when the unit contains a DC back up module.
Disconnect AC and DC power cords and remove the top cover. Check the main DC power
fuse and power cord. If the fuse is blown replace with same type and rating. Please
contact SDI if the fuse blows again or if the event that caused the fuse to blow is not
known.
PPS LED’s do not flash.
Make sure that the provided signal to the instrument conforms with TTL levels.
If the input signal is correct and the LED remains off, the instrument will have to be
returned for repair.
Page 8
8.0 Specifications
PARAMETER CONDITIONS MIN TYP MAX UNITS
Rise time 10 - 90 % - 0.8 0.9 ns
Fall time 10 - 90 % - 0.8 0.9 ns
Propagation delay 50 ohm load - 10 12 ns
Differential delay Channel - Channel - 100 200 ps
Impedance input
output
Input High Level
Input Low Level
Output High Level
Output Low Level
Frequency Range 50% duty cycle 0 100 105 MHz
Temperature-delay
Coefficient
Input signal into
50 ohm load
Input signal into
50 ohm load
50 ohm load
50 ohm load
0 - 50 ºC
-
-
2
-0.7
2.4
-
-
50
50
2.4
0.14
2.7
0.1
3
-
-
5
0.8
2.8
0.2
5
Ohms
V
V
ps/ºC
Page 9
9.0 Warranty and Service
Warranty
The PD-15RMi-C is warranted to be free of defects under normal operating conditions, as specified, for one year from date of 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 a PD-15RMi-C is sold by SDI. SDI makes
no other warranty, express or implied, and makes no warranty of the fitness for any partic-
ular 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.
Service
Do not attempt to service or adjust the instrument unless another person, capable of provi-
ding first aid or resuscitation, is present. Please remember that any alteration or repair may
void the warranty. Contact SDI with any questions or to request an RMA if a repair is needed.
SpectraDynamics, Inc.
1849 Cherry Street Unit 2.
Louisville, CO 80027
USA
Tel: (303) 665-1852
Fax: (303) 604-6088
support@spectradynamics.com
www.spectradynamics.com
Page 10
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