Adjustment of the input amplifier
The Channel A/C input amplifier must be adjusted after the
mounting is complete. The maximum sensitivity of the channel
depends on an accurate adjustment. Please let the counter warm
up for at least 30 minutes before performing the adjusting
procedure!
Required equipment:
A signal source that produces a sine wave between 10 kHz and
1 MHz with an amplitude of about 100 mVpp is ideal.
One of the following:
a) An oscilloscope with a x10 probe. If the probe is
switchable between x1/x10, select x10. x1 probes are
not suitable for this procedure!
b) Multimeter.
The oscilloscope is preferred, as it gives a more accurate result.
Procedure with an oscilloscope
Set the coupling to DC on the oscilloscope.
It is recommended to turn on the 20 MHz bandwidth limit or
the RF reject (sometimes also called Noise Reject) if available
– it will show less noise on the signal and make the adjustment
easier. On digital oscilloscopes, Average mode should be
enabled.
Connect the signal source to Channel A.
Probe pin 3 of IC6. You should see the input signal with
reduced amplitude (shown in red in the picture on next page).
18
Summary of Contents for AE20401
Page 23: ...Finished Component Side Finished Solder Side without the LCD LCD Mounting 17 ...
Page 31: ...Operation Functions Menu Structure 25 ...
Page 37: ...31 Example 1 noise Example 2 one signal superimposed on another ...
Page 50: ...Circuit Diagram Part 1 2 44 ...
Page 51: ...Part 2 2 45 ...
Page 63: ... Nr of valid counts depends on range 57 ...
Page 64: ...ASCEL ELECTRONIC www ascel electronic de 2015 ...