6 Realization of Measurements
6.1 Starting
For external control of the unit the connecting cable RS-232C has to be connected before
switching on the operational voltage.
After pushing the button Power switch [1] the LED [2] lights up and the message
“Testing ....” appears on the display. Internal unit tests for checking operational readiness are
started after switching on and if everthing is in order, the message “UZ 2400 READY !” is
displayed. The unit otherwise displays an error message with a respective notice of the reason,
e. g. “TEST EPROM: ERR!”. The unit interrupts the test until the defect is eliminated.
When the test is successfully completed the unit is set to diagnostic function with the
frequency of the internal time base being measured and displayed with “CHK: 10.00000
MHz”. The measuring time (GATE TIME) is set to 100 ms and the input voltage divider is
set to 1:1.
Now the unit basically is ready to start measurements, but the specified parameters for the
time base are only fully set 15 minutes after switching the unit on.
6.1.1 Settings for Channel A
The signal has to be led to the input socket “A” [10]. Then select the attenuation with the help
of the button “ATTENUATOR” [6]. The message “Attenuator: 1(0):1” appears on the display
[9] and on selecting the divider ratio 10:1 the LED “10:1” [12] lights up. Set the trigger level
with the potentiometer [11] so that a stable value is displayed. Now set the desired measuring
function by means of the button “Function” [4] (see 5/(4)).
No settings have to be made for measurements on channel C.
6.2 Frequency Measurement (FRA, FRC)
Measuring signals with frequencies between 10 Hz and 100 MHz are led to the input socket
“A” [10]. If the periodic signals are between 50 MHz and 2.4 GHz they have to be led to the
input socket “C” [13]. The selection of channel A or C is made by the button “FUNCTION”
and is displayed. The desired measuring times (see 5/(5)) are selected with the button “GATE
TIME” [5]. They are indicated on the display [9]. On pressing the button “MEAS/LOCAL”
[7] the menu operation is finished and the measurement is started.
The input level can be observed with the help of the LEDs “MIN” [14] and “MAX” [15]. The
measuring time is indicated by the LED “GATE” [3] the interval between the single
measurements being fixed at about 200 ms.
6.3 Period Length Measurement
Put the input signal on channel “A” [10]. Turn the counter to the function “PER” (period
length measurement) by actuating the button “FUNCTION” [4]. The selection of a measuring
time (GATE TIME) does not influence the measurement. The measurement is started by
pressing the button “MEAS/LOCAL” [7]. Every second period of the signal is measured.
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Operating Instructions UZ 2400
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