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will be "frozen", i.e. held. This remains so, even when the BNC lead
is disconnected from the item being measured.
- Attenuator (1/20 gain) = ATTEN
If the incoming signal level is higher than 300 mV, this button
should be pressed. For levels lower than 300 mV this button should
not be pressed.
- Resolution
Resolution = decimal places, depends on the gate time (GATE) and
the frequency: Gate time 0.1 sec., up to 5 decimal places; Gate time
1 sec., up to 6 decimal places; Gate time 10 sec., up to 7 decimal pla-
ces.
- PERI = Period measurement
After pressing the PERI button, frequency is not displayed in kHz,
rather its period (= time for one cycle) in µs (= microsecond = exp.
-6)
- A/B = Relationship measurement
After pressing the A/B button, the relationship of channel A to
channel B is displayed,
e.g.: 100 kHz (from the function generator) is present on channel A.
If the same frequency is present also on channel B, Then "1.000000"
is displayed, provided that both frequencies are absolutely identi-
cal.
- A-B = Difference measurement
After pressing the A-B button, the difference A minus B is counted.
- A+B = Addition of A and B
After pressing the A+B button the sum A + B is counted.
- Time interval measurement A ==> B
After pressing the A=>B button the time interval between A and B
in µs (=microsecond) is displayed.
- TOT = "Total measurement" = pulse counter operation
Select this operating mode by means of the TOT button when pul-
ses from electronic switches are to be counted. TOTAL means that
the pulses are summed.
c) Display of signal generator output frequencies on the
LED display
- To be able to read the signal generator frequencies on the LED dis-
play, the bottom right switch on the signal generator must be pres-
sed.
- Because the signal generator can generate 10 MHz max., channel A
should be selected, which can count up to 100 MHz.
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- While the frequency of the built-in signal generator is being mea-
sured, the BNC socket of channel A is inoperative. That is to say even
when an external frequency is introduced into channel A , only the
frequency of the built-in signal generator is measured, provided
that the F/C - F/G switch is pressed (set to F/G).
- Switch the frequency generator on, noting 5.2 without fail.
d) Measurement of external frequencies
1. Switch the measuring instrument and the counter on.
2. Select the channel by pressing the CHAN button.
3. Set a suitable gate time.
4. Connect a screened signal lead with intact BNC plug(s) to the input
socket of the selected channels.
5. Select the correct attenuator (ATTEN) setting. For signals having an
amplitude greater than 300 mV rms, the attenuator should be swit-
ched in. In this case the input signal voltage will be reduced by a
factor of 20, to reduce measurement errors (measurement toleran-
ce).
6. Read off the measured frequency and appropriate measurement
units on the LED display.
e) Measurement of period
1. Switch the measuring instrument and the counter on.
2. Select channel A, B or C by pressing the CHAN button.
3. Press the PERI button once.
4. Connect a screened signal lead with intact BNC plug(s) to the BNC
socket of the selected channels.
5. Read the period t of the signal in µs (=microseconds) on the display.
Remember: f = 1/t and t = 1/f
f) Presentation of the relationship of channel A divided by channel
B = A/B
1. Switch the measuring instrument and the frequency counter on.
2. Press the A/B button.
3. Connect two screened signal leads each with intact BNC plug(s) to
the BNC channels A and B sockets.
4. Read the result in the display.
g) MMeasurement of time interval A=>B
A measurement is started by a signal fed into channel A and stopped
by a signal fed into channel B. The time difference is shown in µs. If
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