Verifying Total Harmonic Distortion - Keithley 2015 Service Manual

1-18 Performance Verification

Verifying total harmonic distortion

Follow the steps below to verify the Model 2015 total harmonic distortion function.
1.
Figure 1-8
Connections for total harmonic distortion verification
Model 2015
REM STEP SCAN CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
TALK
LSTN
SRQ
SHIFT
TIMER HOLD TRIG FAST MED SLOW REL FILT AUTO ERR
MATH T H D dBm dB CONT
Ω2 Ω4
SHIFT DCV ACV DCI ACI
DELAY HOLD LIMITS ON/OFF TEST CAL
LOCAL
EX TRIG TRIG STORE RECALL FILTER REL
POWER
SAVE SETUP CONFIG HALT GPIB RS232
SOURCE MEAS STEP SCAN DIGITS RATE
THD
2.
3.
4.
5.
6.
Connect the low-distortion function generator to the Model 2015 INPUT jacks. (See
Figure 1-8.)
BNC-to-Dual
Banana Plug
Adapter
SENSE
INPUT
Ω 4 WIRE
HI
CH9 CH10 MATH
REAR
4W
350V 1000V
BUFFER STAT !
PEAK PEAK
2015THD MULTIMETER
LO
500V
PERIOD TCOUPL
PEAK
INPUTS
FREQ TEMP
RANGE
F R
AUTO
FRONT/REAR
3A 250V
AMPS
RANGE
EXIT ENTER
Set the function generator to output a 1kHz, 0.95V RMS sine wave with an unbalanced,
high-impedance output.
Using the MEAS key, set the following operating modes:
TYPE: THD
FREQ: AUTO
UPR HARM: 10
UNITS: PERC
SFIL: NONE
Select the Model 2015 THD function by pressing SHIFT then THD.
Use the down RANGE key to select the 1V range.
Verify that the Model 2015 THD reading is <0.004%.
Low Distortion Function Generator
Coaxial Cable
Output