TB 9-6625-2137-35
b. Adjustments. No adjustments can be made.
12. Amplitude
NOTE
If TI is meeting its amplitude accuracy specification for the 75 Ω
input, it is reasonably certain that the other inputs (124 Ω,
135 Ω, 150 Ω, 600 Ω) will meet their specifications as well.
Hence, further testing will not be required.
a. Performance Check
(1) Connect calibrator OUTPUT to multimeter INPUT terminals. Set multimeter
for ac voltage measurements and set calibrator for a 0.273861V, 1 kHz output. Record
multimeter indication (to be used in (15) below).
(2) Disconnect multimeter and connect calibrator OUTPUT to TI 10 Ω⎪⎪ 50 pF
input terminal. Press TI ENTRY [RECALL] [0] (pause until reset is completed) [FREQ]
(3) Set calibrator output frequency to 20 kHz and voltage as listed in table 4. TI
will indicate within the specified limits.
Calibrator
Test instrument indication (dBm)
output
Min
Max
.273861 V
-00.20
+00.20
.866025 V
+09.80
+10.20
2.738613 V
+19.80
+20.20
1
Install ac divider2
2.73861
V
-39.80
-40.20
.866025 V
-49.80
-50.20
.273861 V
-59.80
-60.20
86.6025
mV
-69.80
-70.20
27.3861
mV
-79.80
-80.20
86.6025
mV3
-89.25
-90.75
27.3861
mV
-99.25
-100.75
After obtaining TI indication press ENTRY [RDNG OFFSET] pushbuttons to store
1
+20 dBm value.
2Press TI AVE pushbutton if required to stabilize indications.
3Press MEASUREMENT ENTRY [OFFSET] pushbuttons to offset TI indication by
+20 dBm.
(4) Remove ac divider from equipment setup. Set calibrator for a 0 dBm, 20 kHz
output.
(5) Press TI MEASUREMENT/ENTRY [OFFSET] pushbutton to off and allow TI
to take several readings until an internal CAL cycle is completed.
(6) Press
TI
ENTRY
[RDNG
OFFSET]
pushbutton;
then
press
MEASUREMENT/ENTRY [OFFSET] pushbutton.
