4 - 12
PERFORMANCE TEST
Settings/procedure:
1
-
Switch the CH1 VARiable mode off by simultaneously pressing both
AMPL/VAR keys. The readout changes to 50 mV.
2
-
CH1 sensitivity is 50 mV/div; the vertical deflection is now 4 divisions.
Requirements:
1
-
Activate the CH1 GND function and verify that a horizontal line is
displayed.
2
-
Select the AC input coupling and verify that a 4 divisions square-wave
signal is displayed. Center this signal in the middle of the screen.
3
-
Select the DC input coupling and verify that the 4 divisions square-wave
signal moves up. This shift is caused by the signal’s positive dc
component: this component is not blocked in DC coupled mode.
Repeat the settings and procedure for CH2, CH3, and CH4. PM3370B/80B/90B:
check CH2 and TRIG VIEW via EXT TRIG input for AC and DC coupling.
4.3.9
Vertical cursor accuracy (continuation of 4.3.8.)
This test verifies the accuracy of the voltage cursors
Settings/procedure:
1
-
Change the generator output voltage to 0.1V.
2
-
Apply this voltage to CH1.
3
-
Switch CH1 to ON, and switch the other channels off.
4
-
Select DC coupled input and 20 mV/division for CH1.
5
-
Select CH1 as trigger source (TRIG 1).
6
-
Use the POS control to center the 5 division square wave on the dotted
horizontal lines of the graticule.
7
-
Press the CURSORS menu key.
8
-
Select ’on’ and volt cursors (=) from in the CURSORS menu.
9
-
Select
∆
V from the READOUT menu.
Requirements:
1
-
Use the TRACK and
∆
controls to position both cursor lines exactly on top
and bottom of the signal. Check for a cursor readout between 98.4 and
101.6 mV.
2
-
Press the ANALOG key (’DIGITAL MODE’ is displayed briefly) and repeat
the check in this chapter for the digital mode.
3
-
Press the ANALOG key (’ANALOG MODE’ is displayed briefly) to return
to analog mode.