The potentiometer consists of a slide wire and switch with precision coils. Both slide wire and coils are made from manganin wire and are aged for long term stability before mounting in instrument. The measuring range of the potentiometer can be selected by a range selector switch. Electronic Voltage Reference (EVR) having performance comparable to standard cell operates on built-in dry cells. By adjusting the standardization pots, the measuring potentiometer can be standardized against built-in EVR. A taut suspended galvanometer with the provision of zero adjustment acts as null indicator. Batteries for EVR and for potentiometer are housed in a small pocket in the wooden casing of instrument and are easily accessible for replacement without disturbing the precision parts of this instrument.
This instrument is provided with keys for battery on/off, standardization test and for checking the voltage of battery supplying power to EVR.
A plug socket and a jack for use with external galvanometer, for increasing sensitivity of measurement is also provided. The entire assembly is mounted on a Perspex panel and housed in wooden case with a carrying strap. The lid of the wooden case carries operating instructions, circuit diagram and when the lid is closed, the power supply from the built-in battery is automatically cut off.
- Used for measuring DC potential difference or voltages.
- Equipped with electronic voltage reference, standardization circuit, potentiometer, galvanometer & power supply and yet light weight and portable.
- Useful in most industrial & laboratory applications, where accuracy is of prime importance.
| Measurement range selector |
Main dial
(with 18 steps)
|
Slide wire
(cont. adjustable)
|
Range |
Resolution |
| x 1 |
0-1.7 V |
100 mV |
0-1.8 V |
1 mV |
| x 0.1 |
0-170 mV |
10 mV |
0-180 mV |
100 µV |
| x 0.01 |
0-17 mV |
1 mV |
0-18 mV |
10 µV |
| Internal Resistance |
250 ohms per volt |
| Measuring accuracy |
± 0.1% of range or ± 1 division of slide wire, whichever is greater. |
| Standard source |
Electronic Voltage Reference |
| Standardization |
By coarse and fine control pots |
| Galvanometer |
Built-in taut suspended, pointer type |
| Sensitivity |
1 mm / µA OR 0.05 mm / µV |
| DC voltage source |
0-1.8 V adjustable |
| Keys |
For battery ON/OFF, standardization, test and EVR Test |
| Power Supply |
Two dry cells of 1.5 V R20 size for Potentiometer
Two dry cells of 1.5 V R20 size for EVR
|
| External Galvanometer |
Low Resistance, higher sensitivity can be used e.g. Type PL64 |
| Size |
285 x 215 x 164 mm (approx.) |
| Weight |
5.0 kgs (approx.) |
- Used for measuring DC potential difference or voltages and also as DC voltage supply source from 10 micro volts to 1.8 volts.
- Potentiometers are widely used as user controls, and may control a very wide variety of equipment functions.
- In many applications, such as position sensors.
- To control electrical devices such as volume controls on audio equipment.
PL52N-Portable_Potentiometer(PL 52)