Keithley 3940 Service Manual page 43

Multifunction synthesizer
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ELECTRICAL SPECIFICATIONS (CONT.)
Output Characteristics
Maximum Output
AC only
1 ZOVp-p/open, lOVp-p/5OR
DC only
1 flOV/open, &5V/5OSJ
Display
Display switchable between open circuit voltage (/OPEN) and voltage into 5On load (/5Of~)
However, for dBm, value displayed is always for a 5022 load (/50&J). For an arbitrary waveform the
units are always Vp-p and the displayed voltage corresponds to the data values -511 and +511.
AC
VP-P
Max. 3 digits
Minimum
O.OlmVp-p/open
Resolution
O.OlmVp-p/5OLa
Vrms
Max. 3 digits
O.OlmVrms/open
O.OlmVrms/5OQ
dBV
Max. 3 digits
O.ldBV/open
and minus sign
O.ldBV/JOR
dBm
Max. 3 digits
O.ldBm/50R
and minus sign
DC
Max. 3 digits
O.lmV/open
and minus sign
O.lmV/SOn
AC amplitude range for OV DC offset
See Table B-l.
AC amplitude resolution and accuracy for OV DC offset
See Table B-2.
Voltage range, resolution, and accuracy for DC only
See Table B-3.
Minimum AC amplitude, resolution, and DC voltage
See Table B-4.
accuracy for AC + DC
Amplitude Frequency
In CONT mode, 1kHz reference frequency, OV DC offset, 5OQ load, and amplitude setting of
Characteristics
lOOmVp-p to lOVp-p for waveforms other than 'L . (rms amplitude for% .)
2r
UptolMHz
+0.3dB (RMS)
1MHzto7MHz
+0.3, -0.5dB (RMS)
7MHz to 1OMHz
+0.3, -l.OdB (RMS)
1OMHi to 2OMHz +0.3, -25dB (RMS)
n
up to IMHZ
33% (p-p)
(At duty cycle
fixed/variable
50%)
\
up to 100kJ7rz
53% (p-p)
ntu
up to lOOkHa
i5% (p-p)
YJ
In CONT mode, OV DC offset, 5OQ load, and lO.OVp-p amplitude setting
spectrum purity
Total Harmonic
1oHz to 100kHz
0.3% max
Distortion
Harmonics
1OOkHz to 2OMHz 35dBc max
Spurious
up to 2oMHz
-4OdBc max
I
5OfJ load, OV DC offset and 1OOmVpp amplitude setting
Naveform
Risetime, falltime
8ns max (15ns max in modes other than CONT mode, when stop
Characteristics
level is RESET)
Overshoot, undershoot
5% max of output p-p amplitude
Duty cycle
(Not during sweep in CONT mode)
Accuracy for fiied
up to 1ookHz
1 ztO.3% of period
duty cycle (50%)
1OOkHz to 1MHz
Irk296 of period
Variable Range
5.0% to 95.0% (resolution 0.1%)
Accuracy
fl% of period (up to lMHz), jitter 1511s max
ktput
impedance
SOL& unbalance
Zonnector
BNC receptacle on front panel

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