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5.1 Working with the frequency counter
Frequency counter controls*
1. LED display
2. Input socket A for 5 Hz to 100 MHz, 1 MOhm
3. Input socket B for 0.2 Hz to 100 MHz, 50 Ohm
4. Input socket C for 100 MHz to 1300 MHz, 50 Ohm
5. Function buttons block I: ATTEN = Incoming signal attenuator
CHAN = A, B and C channel selection
GATE = 0.1sec, 1sec and 10sec gate time
HOLD = Frequency value hold
6. Function buttons block II: FREQ = Display of measured values in
PERI
A/B
A => B = Time interval measurement
A - B
A + B = Channel A plus channel B
TOT
* The AC power switch ("FREQUENCY COUNTER") for the frequency
counter is at the rear of the MS 9160 case.
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selection
Hz, kHz or MHz
= Display of period in µs
= A/B relationship
= Channel A minus channel B
= Total = pulse counter
Attention !
Check for correct positioning of the AC power voltage switch in the AC
power input module on the rear of the case. Check that the AC power
fuse in the fuse holder is as prescribed, both while observing safety
rules. (pull out the AC power plug!)
Make sure that the correct AC power switch is operated. The instrument
should be warmed up for approx. 20 minutes for completely accurate
operation.
Preparations
a) Initial switch settings
- Check the BNC socket for damage or short-circuit (visible check).
- Set the display selection switch to the FC position (not pressed in).
This switch is in the the function generator controls area at the bot-
tom right (under the round scale).
- Switch on the frequency counter. The switch is located on the rear
of the instrument. Immediately after switch-on, the following self
test occurs relatively quickly:
First, all LEDs, segments and decimal points light up, then
"PASS_ALL" and afterwards "UC 1300" should be seen in the LED
display.
- Set the gate time to 1 s (second) and then press the GATE button
until the LED behind "1" lights.
- Press the CHAN (channel) button, until the LED behind A lights.
- Now read "0.0000000" on the display and immediately to its right
read the measurement unit MHz.
b) Measurements
- According to in which frequency range measurements are to be car-
ried out, select either channel A, B or C by pressing the CHAN but-
ton.
In CHAN A position, frequencies from 10 Hz to 100 MHz will be
measured. This applies also to channel B. Channel C is for frequen-
cies from 100 MHz to 1300 MHz.
- Setting the gate time. To achieve the highest possible resolution,
select a suitable gate time.
- HOLD Function
If the button "HOLD" is pressed, the most-recently read frequency
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