The Digital mV/mA Calibrators (HandyCal 38503) are handheld, battery-operated, precision instruments designed for sourcing as well as measuring mV and mA signals. An exceptionally stable source provides continuously variable precision mV and mA output signals with two ten-turn potentiometers. A self-check facility establishes correct functioning of all circuit blocks. They are specially designed for cost-effective mass calibration of a select subset of a various process control instruments and systems.
|
| 3½ digit | 12 mm LCD with a resolution of 1 in 2,000 |
| 4½ digit | 8 mm LCD with a resolution of 1 in 20,000 |
| I/O Option | Display | Ranges | Resolution |
|---|---|---|---|
| A | 3½ digits | 20mV/20mA | 1 in 2,000 |
| D | 4½ digits | 200mV/20mA | 1 in 20,000 |
| Input Impedance |
Voltage | > 1 Megohm |
| Current | 1 or 10 ohm depending on range | |
| Input Protection |
Voltage | Input Terminals Protected for 24 V DC |
| Current | Input Terminals Protected for upto double the mA range | |
| Output Impedance |
Voltage | < 0.05 ohm |
| Current | > 1 Megohm | |
| Source Capacity at 90% Bat Volt | Voltage | Up to 250 mV minimum into 250Ω |
| Current | Up to 20mA minimum into 250Ω (800Ω with loop power of 24V) |
Accuracy and Self-Check @ operating temperature between 22-32 °C and valid for one year Calibration Cycle:
| Accuracy | Self-Check (on the display) | |
|---|---|---|
| 3½ digit | ±0.05% of rdg ±0.05% of f.s. ±1 dgt | 1777±1 |
| 4½ digit | ±0.02% of rdg ±0.02% of f.s. ±2 dgts | 17777±2 |
Power Supply options are as follows:
| Option | Battery Type | Battery Life |
|---|---|---|
| A |
One 9V dry cell |
5 ~ 6 Hrs in continuous use for mV |
| 1 ~ 2 Hrs in continuous use for mA | ||
| B |
One 9V Ni-Cd cell |
12 ~ 15 Hrs in continuous use for mV |
| 6 ~ 8 Hrs in continuous use for mA |
| Low Battery | Indicated by lighting all decimals or "LO BAT" indicator |
| Mains Operation | A Jack is provided for an external Battery Eliminator/Charger |
| Rated Temp | 5 to 55 °C |
| Humidity | < 90% RH (Non-Condensing) |
| Zero Drift | < 1dgt for every 10°C beyond the specified ambient of 22 - 32 °C |
| Span Drift | < 0.0015% of rdg / °C |
| Storage Temp | 0 to 70 °C (Without Batteries) |
| Enclosure Size | 75(W) x 150(H) x 50(D) mm |
| Enclosure Finish | Powder Coated |
| Enclosure Weight | 0.6 Kg (Without Batteries & Accessories) |
