IMC C SERIES User Manual

© 2018 imc Test & Measurement GmbH
imc C-SERIES - Manual, Version 4 R 3 - 2018-10-19
131General technical Specs
Synchronization and time base
Time base of individual device without external synchronization
Parameter
Value typ.
min. / max.
Remarks
Accuracy RTC
±50 ppm
not calibrated (standard devices), at 25°C
1 µs (1 ppm)
calibrated devices (upon request), at 25°C
Drift
±20 ppm
±50 ppm
-40°C to +85°C operating temperature
Ageing
±10 ppm
at 25°C; 10 years
Time base of individual device with external synchronization signal
Parameter
GPS
DCF77
IRIG-B
NTP
Supported formats
NMEA / PPS
(1)
B000, B001
B002, B003
(2)
Precision
±1 µs
<5 ms
after ca. 12 h
(3)
Jitter (max.)
±8 µs
Voltage level
TTL (PPS)
RS232 (NMEA)
5 V TTL level
---
Input impedance
1 kΩ (pull up)
20 kΩ (pull up)
---
Input connection
DSUB-9 "GPS"
not isolated
BNC "SYNC" (isolated)
(test voltage: 300 V, 1 min.)
RJ45 "LAN"
Cable shield
connection
BNC: isolated Signal-GND
(marked with yellow ring)
---
Synchronization of multiple devices via DCF (Master/Slave)
Parameter
Value typ.
min. / max.
Remarks
Max. cable length
200 m
BNC cable type RG58 (propagation delay of cable needs
to be considered)
Max. number of
devices
20
only slaves
Common mode
SYNC not-isolated
0 V
with non-isolated BNC connector: devices must have the
same ground voltage level, otherwise signal integrity
issues (signal artifacts and noise) may result
SYNC isolated
max. 50 V
with isolated BNC connector: SYNC-signal is already
internally isolated, for reliable operation even with
different ground voltage level (ground loops)
Voltage level
5 V
DCF input/output
"SYNC" connection
BNC
(1)
(2)
(3)
PPS (Pulse per second): signal with an impulse >5 ms is necessary
using BCD information only
Max. value, concerning the following condition: first-synchronization

IMC C SERIES Specifications

General

Brand	IMC
Model	C SERIES
Category	Measuring Instruments
Language	English