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4279A 1 MHz C-V Meter
• Measurement time: 10 ms/20 ms/30 ms
• Measurement accuracy: 0.1% (20 ms)
• Internal dc bias: 0 V to ±38 V, 0.1% programmable sweep
• Measurement range : 0.00001 pF to 1280 pF
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High Test Throughput
and Reliability for
Semiconductor C-V Testing
The Agilent 4279A 1 MHz C-V meter offers the optimum
solution for increasing quality and throughput when
measuring the capacitance vs. bias voltage characteristics
of semiconductors. The 4279A measures capacitance
over a range of 0.00001 pF to 1280.00 pF with a basic
accuracy of 0.1% and a 6 digit display resolution while
sweeping the dc bias voltage. An internal, programma-
ble dc bias sweep source with a 0.1% voltage accuracy
throughout the ±38 V range assures very low measure-
ment error due to bias voltage uncertainty. It makes the
4279A ideal for the precise characterization and testing
of varactor diodes, MOS diodes, etc. Measurement time
can be selected from three modes of 10 ms, 20 ms and
30 ms/meas. to maximize productivity. The 4279A's very
fast ranging and high speed GPIB data transfer capabilitiesreduce test time. The automatic bias polarity control feature
allows quick selection of the correct polarity bias voltage
for the device under test. This new function eases manual
testing of samples in incoming/outgoing inspection and
provides a simple method of polarity control for automatic
• C -V measurement for performing doping profile
• C -V characterization and sorting of varactor diodes.
• Capacitance testing of rf mixer and switching diodes.
• Testing capacitors with an applied dc bias for
1. Accuracy specified at ambient temperature of 23 C° ± 5 C°
2. Measurement time is supplemental performance data(not specified)
3. Resolution and accuracy apply to bias voltage below 4V
Measurement parametersC, DF, Q, ESR, GTest frequency1 MHzTest signal level20 mV, 50 mV, 100 mV, 200 mV, 500 mV, and 1 VrmsMeasurement range C0.00001 ~ 1280.00 pFDF0.00001 ~ 9.99999 (Q displays 1/DF)
Measurement time210 ms (short) /20 ms (medium) /30 ms (long)
Test cable length0m, 1m, 2m
Internal DC bias3Voltage Resolution Basic accuracy
0 to ± 38 V 1 mV ± (0.1% + 1 mV)Bias sweep51 points max, GPIB programmable
Agilent 4279A key specifications
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Measurement display output
Basic measurement accuracy of 0.1%
and 6 digit display resolution.
Large LCD display
For easy viewing of instrument
settings and measurement results.
Monitor display and system messages
Allows verification of measurement setup
and instrument operation.
0 m/1 m/2 m test cables, and error compensation
Enables accurate measurements even on the low capaci-
tance ranges when using test cables. 0pen/short and stan-
dard compensation eliminates measurement errors due to
test cabling and fixturing.
Softkeys for user friendly, fast and
convenient instrument setup
For high speed data acquisition
and instrument control
Internal dc bias sweep source
Precise bias voltage sweep with a voltage setting
accuracy of 0.1% is obtained by downloading an
GPIB sweep program. Auto polarity bias eliminates
the need of checking the polarity of the DUTs.
High speed measurement
Three measurement time modes (10 ms/20 ms/30 ms)
allow you to optimize test throuhput and accuracy.
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Parameters measured:C-DF, C-Q, C-ESR, C-G
Measurement circuit modes:series
Ranging modes:Auto, manual and program
Measurement terminals:Four-terminal pair
Test cable length:0, 1, and 2 meters
Integration time:Short, medium and long (refer to
supplemental performance data for measurement time)
Trigger:Internal, external and manual
Trigger delay:programmable delay from the trigger
command to the start of the measurement, 0 to
1000 ms in 1 ms steps.
Averaging: 1, 2, 4,…
, 128, and 256, programmable
Error-correction: Zero open and short adjustments,
offset compensation, and STD compensation (which
improves measurement accuracy by using a
standard capacitor as a reference.)
• Test signal
Test frequency and accuracy:1 MHz, ± 0.02%
Signal level (unknown terminal open):20 mV, 50 mV,
100 mV, 200 mV,500 mV, and 1 Vrms, selectable.
LCD Dot-matrix display. Capable of displaying
measured values, control settings, self test
messages, and annunciations.
Display digits:4, 5, 6 digits, selectable, maximum
• GPIB interface
Remote control and ASCII or binary data
output. Packed data output when the swept bias
measurements are made.
C0.00001 pf to 1280.00 pf
DF0.00001 to 9.99999
Q0.1 to 9.99999
ESR0.001 Ωto 999.999 kΩ
G0.0001 µS to 9.99999 mS
1. 6 C ranges 2 pF to 1024 pF full scale.
25% overranging on all ranges, when DF ≤0.2.
2. Q displays l/DF
3. ESR and G ranges depend on the capacitance value.
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Specified at the UNKNOWN terminals and at the end of
the standard 1m or 2m test leads under the
1. Warm-up time: ≥10 minutes
2. Ambient temperature is 23 °C ± 5 °C and
short term drift is less than 0.2 °C/minute.
3. Test cable length is 0 or 2 meters
4. Zero open/short compensation has
5. DF ≤0.2
Error tolerances double when ambient temperature is
within the 5 °C to 18 °C, or 28 °C to 45 °C range.
Accuracies are relative to the calibration standards.
• C-DF measurement accuracy
C range (Cf)Test signal level20 mV 500 mV, 1V
1024 pF0.15% + 0.05%
512 pF0.07% + 0.03%
128 pF0.07% + 0.03%
0.0004 + 0.0003/a*
32 pF0.15% + 0.08% 0.1% + 0.05%
0.06% + 0.04% 0.07% + 0.03%
0.07% + 0.03% 0.07% + 0.03%
0.0004 + 0.0003/a0.0004 + 0.0003/a*
8 pF0.15% + 0.15%
0.06% + 0.08%
0.06% + 0.05%
0.0004 + 0.0007/a
2 pF0% + 0.5% 0.1% + 0.05%
0% + 0.3% 0.06% + 0.04%
0% + 0.2% 0.06% + 0.04%
0.003/a0.0005 + 0.0005/a
1. The above accuracy table provides short, medium
and long integration accuracy equations.
C Accuracy in short
C Accuracy in medium
C Accuracy in long
DF Accuracy in long
2. Accuracy equations are read as follows:
C: ± (% of reading + % of full scale)
DF: ± (absolute DF value)3.
where, Cx is the capacitance reading and Cf is
the full scale value of selected capacitance range.
4. DF accuracy at 1024 pF range is 0.0007 + 0.0003/
(contact the nearest Agilent sales office for more
detailed accuracy specifications.)
• Multi channel error correction
Zero open/short adjustments and STD compensation
for each measurement path (max. 16 channels).
lnternal bias: 0 V to ± 38 V
Bias voltage range Resolution Accuracy (23 °C ± 5 °C)
± (0.000 ~ 4.000) V 1 mV ±(0.1% of setting +
± (4.002 ~ 8.000) V 2 mV ±(0.1% of setting +
± (8.005 ~ 20.000) V 5 mV ±(0.1% of setting +
± (20.01 ~ 38.00) V 10 mV ±(0.1% of setting +
Bias voltage sweep:max. 51 sweep points can be
programmed via GPIB.
Step delay:programmable delay from the step
(up or down) in bias voltage to the start of the
measurement , 3 to 1000 ms in 1 ms steps.
External bias: 0 V to ± 100 V
Operating temperature and humidity:5 °C to 45 °C,
≤95% RH at 40 °C
Power requirements: 100/120/220 V ± 10%,
240 V + 5% - 10%; 48 Hz to 66 Hz; 200 VA maximum
Size:177(H) x 426(W) x 498(D) mm
Weight:approximately 15 kg
0ption 4279A-003:1% test frequency shift.
Prevents possible test signal interface from other
1 MHz signal sources.