Performance Verification
1-16
1.8.6 Frequency accuracy verification
Frequency accuracy verification is performed by connecting
an accurate frequency source to the Model 2001 inputs, and
then verifying that the frequency readings are within stated
limits.
Use the procedure below to verify the frequency measure-
ment accuracy of the Model 2001.
1. Connect the frequency synthesizer to the Model 2001
INPUT terminals, as shown in Figure 1-9.
2. Turn on both instruments, and allow a one-hour warm-
up period before measurement.
3. Set the synthesizer operating modes as follows:
FREQ: 1Hz
AMPTD: 5V p-p
OFFSET: 0V
MODE: CONT
FCTN: sine wave
4. Restore Model 2001 factory defaults, as explained in
paragraph 1.7.
5. Press FREQ to place the Model 2001 in the frequency
measurement mode.
6. Set maximum signal level to 10V as follows:
A. Press CONFIG then FREQ.
B. Select MAX-SIGNAL-LEVEL, then press ENTER.
C. Select VOLTAGE, then press ENTER.
D. Select 10V, then press ENTER.
E. Press EXIT to return to normal display.
7. Verify that the Model 2001 frequency reading is within
the limits shown in the first line of Table 1-10.
8. Set the synthesizer to each of the frequencies listed in
Table 1-10, and verify that the Model 2001 frequency
reading is within the required limits.
Table 1-10
Frequency verification limits
Synthesizer
frequency
Reading limits
(1 year, 18° to 28°C)
1Hz
10Hz
100Hz
1kHz
10kHz
100kHz
1MHz
10MHz
15MHz
0.9997Hz to 1.0003Hz
9.997Hz to 10.003Hz
99.97Hz to 100.03Hz
0.9997kHz to 1.0003kHz
9.997kHz to 10.003kHz
99.97kHz to 100.03kHz
0.9997MHz to 1.0003MHz
9.997MHz to 10.003MHz
14.995MHz to 15.005MHz
Figure 1-9
Connections for frequency accuracy verification
NEXT
DISPLAY
PREV
POWER
DCV
ACV
DCI
ACI
Ω
2
Ω
4
FREQ
TEMP
REL
TRIG
STORE
RECALL
INFO
LOCAL
CHAN
SCAN
CONFIG
MENU
EXIT
ENTER
RANGE
AUTO
FILTER
MATH
RANGE
2001 MULTIMETER
SENSE
Ω
4 WIRE
HI
INPUT
LO
INPUTS
CAL
500V
PEAK
F
R
FRONT/REAR
2A 250V
AMPS
350V
PEAK
1100V
PEAK
1.0000 MHz
Model 2001
3940 MULTIFUNCTION SYNTHESIZER
BNC-to-Dual
Banana Plug
Adapter
50
Ω
BNC Coaxial Cable
Model 3940 Synthesizer
Main
Function
Output
