2461Type C User Manual
Racal Instruments
1998
Performance Verification and Adjustments 6-11
Ratio 1:2 Test
Set the UCT to its default state. Select Ratio 1:2 as the
measurement mode, 50
Ω
for input 1 impedance, DC coupling
for input 2, external frequency standard, and set the
measurement resolution to three digits.
Equipment: Signal Generator
Configure UCT as follows:
*RST
returns UCT to default state
INP1:IMP 50
selects 50
Ω
impedance for Input 1
INP2:COUP DC
selects DC coupling for Input 2
Connect the signal generator’s RF and LF outputs to the UCT’s
Inputs 1 and 2 as shown in Figure 6-5. Set the signal generator
to 50MHz, 100mV rms. Check that the UCT measurement
result is 50000 +/- 10.
Figure 6-5, Ratio 1 : 2 Test Configuration
Command Syntax:
MEAS1:FREQ:RAT? measures the ratio of frequencies at
Inputs 1 & 2
Disconnect the test equipment.
GATE
IN
1
VT1
VT2
ARM
T2
IN
STD
OUT
IN
2
OSC
UCT
IN 3
SIGNAL GENERATOR
RF OUT
INPUT 1
INPUT 2
1KHz AF OUT
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