The picoammeter CP10A is a mains powered instrument for measuring DC currents with 10 full scale ranges of 1.0 x10
-3A to 1.0 x10
-12A.
The front panel LCD has a full scale reading of 10.00 and a rear panel socket provides access to a voltage proportional to input current. A front panel control enables the output to be offset by ±100mV to facilitate driving unipolar voltage to frequency converters. A rear panel mounted 'D' socket provides indication of range, status and power for a remote indicator. A front panel switched output smoothing control provides risetimes of 100µs to 300ms in 8 positions with a 1, 3, 10 sequence. The backlit LCD brilliance is front panel adjustable. An audible warning is given when the input signal exceeds the selected range full scale by 20%.
Specifications:
At 20°C after 10 minutes settling period and output offset nulled.
| Range |
DPM Error |
O/P Error |
Temp. Co. |
Typ. Stability |
| (A FSD) |
(%) |
(%) |
(ppm/°C) |
(% Per Year) |
| 10x10-4 |
1.5 |
1 |
±50 |
±0.1 |
| 10x10-5 |
1.5 |
1 |
±60 |
±0.1 |
| 10x10-6 |
1.5 |
1 |
±50 |
±0.1 |
| 10x10-7 |
1.5 |
1 |
±60 |
±0.1 |
| 10x10-8 |
2.5 |
2 |
±150 |
±0.2 |
| 10x10-9 |
2.5 |
2 |
±160 |
±0.2 |
| 10x10-10 |
2.5 |
2 |
±150 |
±0.2 |
| 10x10-11 |
2.5 |
2 |
±160 |
±0.2 |
| 10x10-12 |
3.5 * |
3 * |
-1000 typ |
±0.5 |
| 10x10-13 |
3.5 * |
3 * |
-1000 typ |
±0.5 |
* Plus residual current of 2x10
-14A max.
| Initial Input Offset
| <20uV
|
| Input Offset With Temp.
| ±10uV/°C
|
| Input Offset With Time
| ±50uV per year
|
| Input Offset With Signal
| 10uV
|
| Output Risetime
| 100us to 300ms switchable
|
| Input Connector
| BNC on front panel
|
| Analogue Output
| BNC on rear panel
|
| Output Impedance
| 50 ohms
|
| Output Scaling
| ±10V for ±FSD on selected range
|
| Digital Outputs
| 9 way 'D' on rear panel
|
|
| TTL level Range indication (4 lines)
|
|
| TTL level Supply On indication (1 line)
|
|
| TTL level Over-range indication (1 line)
|
|
| 24V dc supply output for remote indications
|
| Overload Withstand
| 100V dc or rms ac on 10x10-4 and 10x10-5A ranges
|
|
| 250V dc or rms ac on all other ranges
|
| Mains Connector
| IEC
|
| Mains Supply
| 230V or 115V (switchable), 48 to 440Hz, 15VA max
|
| Weight
| 2.5kg
|
| Dimensions
| 210 x 120 x 220mm deep (free standing version)
|
This instrument is also available half width 3U rack mounting. The input connector can be provided on the rear panel as an option.
A remote indicator unit with DPM and range and status indications is also available.
