TB 9-4931-538-40
b. Adjustments. No further adjustments can be made.
9. Dc Voltage Measurement and RMS Noise
a. Performance Check
(1) Set the display menu and mainframe settings to meet the following conditions:
(a) Press Display key. Display Mode to Averaged is highlighted. NUMBER
OF AVERAGES to # Averages = 16. Screen to Single is highlighted. Graticule to
Grid is highlighted. Bandwidth to 12.4 GHz is highlighted.
(b) Press Channels key. Channel 1 through 4 display Off is highlighted.
VOLTS/DIV to Sensitivity = 5.000 mV/div. OFFSET to Offset = 0.000 V. PROBE
ATTEN to Chl Atten Factor = 1.000.
(c) Press Timebase key. TIME/DIV to Sweep Speed = 1.00 ms/div.
DELAY to Delay = 200.000 ns. Delay Ref at Left is highlighted. Freerun/Trg'd
Sweep to Freerun is highlighted. FREERUN RATE to 10 kHz is highlighted.
(d) Press Trigger key. TRIGGER LEVEL to Trigger Level = 0.000 V.
Slope to Pos is highlighted. PROBE/ATTEN to Ext Atten Factor = 1.000. HF Sens to
Off is highlighted. HF Reject to Off is highlighted.
(e) Press More and Network keys.
Reflect/Trans/Cal to Reflect is
highlighted. Step & Chan 1 to Off is highlighted.
(2) Press SYSTEM CONTROL SAVE SETUP and ENTRY 1 pushbuttons.
(3) Press More and Channels keys and set VOLTS/DIV to Sensitivity = 80
mV/div for Channel 1 through 4.
(4) Press Display key. Set Display Mode to Persist and Persistence = 300 ms
is highlighted.
(5) Press SYSTEM CONTROL SAVE SETUP and ENTRY 2 pushbuttons.
(6) Press SYSTEM CONTROL RECALL SETUP and ENTRY 1 pushbuttons.
Press Channels key and set Channel 1 to display On is highlighted.
(7) Press Delta V key. Set V Markers On and overlay both MARKERS on
Channel 1. Press Preset Levels key until 50%-50% is highlighted.
(8) Press SYSTEM CONTROL CLEAR DISPLAY pushbutton and wait for 16
averages to accumulate (#Avgs = 16 top left of display).
(9) Press Auto Level Set key. Display V(1) value will indicate 0 V (2.16 mV).
(10) Press Display key and change Bandwidth to 20 GHz is highlighted.
(11) Press SYSTEM CONTROL CLEAR DISPLAY pushbutton and wait for 16
averages to accumulate. Press the Delta V and Auto Level Set keys. Display V(1) value
will indicate 0 V (2.16 mV).
(12) Connect equipment as shown in figure 3.
