| The
Frequency Difference Meter compares two signals of high stability and
displays small frequency differences on a centre zero meter. The
basic model is effective over the frequency range 0.1 to 1.5 MHz with a
resolution of 10-4 Hz (1 x 10-10 at 1 MHz).
Optional frequency dividers may be preset internally to ratios of 2, 5, or
10, separately for each channel. This extends the operating range to
15MHz or alternatively allows reduced sensitivity for a given input
frequency. |
|
|
| Input Frequency - basic
model |
0.1 to
1.5MHz |
| Input Frequency - with
dividers |
|
|
÷2 |
0.2 to 3.0MHz |
|
÷5 |
0.5 to 7.5MHz |
|
÷10 |
1.0 to 15.0MHz |
| Input Level |
0.5 to 2.0V
rms |
| Input Impedance |
50ohms |
| Display - basic
model |
±1 x 10-3
Hz full scale with resolution of 1 x 10-4 Hz (equivalent
to full scale reading of 1 x 10-9 and a resolution of 1 x 10-10
at 1MHz) |
| Display - with
dividers |
±N x 10-3
Hz full scale where N is the input divide ratio |
| LED Indicators |
Gives 'in
range' indication, and is absent if: |
|
frequency
difference is > |
|
either
input is absent or low |
|
signal
noise is too high for reliable operation |
| Accuracy |
At Centre
Zero |
|
At FSD |
| Power Supply |
230V AC,
50Hz |
|
24V DC
option |
| Dimensions |
Rack
mounted Euronorm module 21HP wide |
|
128.5mm
high |
|
106.3mm
wide |
|
254.0mm deep |
| Options |
Output
alarm if preset frequency difference level is exceeded |
|
External
Output for data logging |
Back