LCR & RESISTANCE METERS
360
1 kHz/1 MHz Capacitance Meter
HP 4278A
• Measurement speed: 6.5 ms/10 ms/21 ms
• Measurement parameters: C-D,Q,ESR,G
• C-D measurement accuracy:
0.07%, 0.0005 (1 kHz, 21 ms)
0.05%, 0.0002 (1 MHz, 21 ms)
• High resolution: 6 digit, D:0.00001
• Intelligent built-in comparator: 10-bin sorting
HP 4278A
HP 4278A Capacitance Meter
The HP 4278A 1 kHz/1 MHz capacitance meter is a high-speed, highly
reliable, precision test instrument aimed at incoming/outgoing capacitor
inspection applications on the production line and in quality control. The
HP 4278A will improve test efficiency by performing comparative mea-
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surements of low to medium value capacitors (up to 200 µF—a range that
covers most ceramic and film capacitors).
The HP 4278A’s standard measurement frequencies and oscillator
output levels are 1 kHz/1 MHz and from 0.1 V to 1 V in 0.1 V steps,
respectively.
The built-in comparator function of the HP 4278A gives you the ability to sort parts into ten bins. A high-speed HP-IB interface and an optional handler interface are available for combining the HP 4278A with an
automatic handler and an external computer, to build a total solution for
automatic testing and data acquisition and analysis.
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Specifications (Refer to data sheet for complete specifications.)
Measurement Parameters: C-D,Q,ESR,G
Display: Dot-matrix LCD. 4, 5, 6 digits, selectable
Measurement Circuit Modes: Parallel and series
Test Signals
Frequency: 1 kHz and 1 MHz, ±0.02%
Signal Level: 0.1 to 1 V rms, ±10% (C≤20
Measurement Time Modes: SHORT, MEDIUM, and LONG
Measurement Times
Mode SHORT MEDIUM LONG
Time* 6.5 ms 10 ms 21 ms
*Measurement time includes settling, integration (analog measurements), calculation,
and comparison times.
Measurement Range
Measurement 1 KHz
Parameter
C 0.001
D
1. 1 kHz normal mode: 7 decade ranges 100 pF to 100 µF full scale.
100% overranging on all ranges, (max. 200000 counts) when D %0.5.
2. 1 MHz normal mode: 11 binary ranges, 1 pF to 1024 pF full scale.
25% overranging on all ranges, when D %1.
3. 1 MHz high accuracy mode: Measurement range is ±30% of the
user-defined nominal value, maximum 2048 pF, when D %0.05.
pF to 200.000 µF
0.00001 to 9.99999
µ
F), in 0.1 V rms steps
1 MHz normal mode
1 MHz high accuracy
0.00001 pF to 1280.00 pF
0.00001 pF to 2663.00 pF
0.00001 to 9.99999
.000001 to .999999
Measurement Accuracy
It is specified at the UNKNOWN terminals and at the end of
standard 1- or 2-m test leads under the following conditions:
1. Warmup time: ≥10 minutes
2. Ambient temperature is 23 ±5˚ C and variance is less than 0.2˚ C/minute
3. Test signal level is set to 1 V rms
4. Zero OPEN/SHORT compensation has been performed
5. D %0.05 for 1 MHz High Accuracy Mode,
D %0.1 for 1 kHz and 1 MHz Normal Modes
6. Accuracies are only valid when the measured value is equal
to the full scale of each range
7. Accuracy stated in the tables is given for LONG integration time
8. Accuracy equations are read as follows:
C:±(% of reading + % of full scale)
D:±(% of reading + absolute D value)
(C:±(% of reading + absolute C value) for Table 3)
Table 1: 1 kHz Measurement Accuracy
C range C D
100 µF 0.07% + 0.025% 0.065% + 0.0025
100 pF to 10 µF 0.05% + 0.025% 0.05% + 0.0005
Table 2: 1 MHz Normal Mode Measurement Accuracy
C range C D
256 to 1024 pF 0.1% + 0.02% 0.1% + 0.0005
4 to 128 pF 0.05% + 0.02% 0.1% + 0.0005
2 pF 0.05% + 0.03% 0.1% + 0.0005
1 pF 0.05% + 0.06% 0.1% + 0.001
Table 3: 1 MHz High Accuracy Mode Measurement Accuracy
Nominal C +
Open Circuit C C D
1024 to 2048 pF 0.11% 0.0004
256 to 1024 pF 0.07% 0.0003
4 to 256 pF 0.05% 0.0002
2 to 4 pF 0.06% + 0.0004 pF 0.0003
0 to 2 pF 0.08% + 0.0004 pF 0.0006
Trigger Modes: Internal, external, or manual
Measurement Terminals: Four-terminal pair, guarded
Cable Length Compensation: 0, 1, or 2 m
Compensation Function: Zero OPEN/SHORT, standard, offset
Comparator: Ten-bin sorting for capacitance, and go/no-go testing
for D, Q, ESR, and G
Self Test: Checks the HP 4278A’s basic operation
Memory Card: External memory for storing and recalling control
settings and comparator limits
General Specifications
Operating Temperature/Humidity: 5˚ to 45˚C, 95% RH @ 40˚ C
Power: 100, 120, 220 Vac ±10%, 240 Vac +5 –10%, 48 to 66 Hz, 200 VA max.
Size: Approximately 426 mm W x 177 mm H x 498 mm D
(16.77 in x 6.97 in x 19.61 in)
Weight: Approximately 15 kg (33 lb, standard)
Key Literature
HP 4278A Capacitance Meter Data Sheet, p/n 5952-7882
Ordering Information
HP 4278A 1 kHz/1 MHz Capacitance Meter
Opt W30 Extended Repair Service (see page 592)
Opt 001 1 kHz Test Frequency Only
Opt 002 1 MHz Test Frequency Only
Opt 003 1% Frequency Shift: Prevents possible test
signal interference when component test contacts
are located close to those of other test units
Opt 101 HP-IB Compatibility
Opt 201 Handler Interface
Opt 202 Handler Interface
Opt 301 Scanner Interface
Accessories Available
HP 16270A Memory Card Set
HP 16334A Tweezer-Type Test Fixture for Chip Components
HP 16047A Direct-Coupled Test Fixture
HP 16047C Test Fixture
HP 16048A Test Leads, BNC (1 m)
HP 16048B Test Leads, SMC (1 m)
HP 16048D Test Leads, BNC (2 m)
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