AC Voltmeters
Analogue and digital AC voltmeters covering the ranges 1 mV to 1000 V, and 20 Hz to 1 MHz (<2 x 107 V-Hz) will normally be calibrated against the Laboratory AC voltage calibrators.
AC voltmeters will normally be calibrated at 5 test voltages for one range to establish the scale linearity. For multi-range voltmeters, additional measurements will be made at full range for all the other ranges.
Linearity check for other ranges may be offered upon request at additional charge.
For precision AC voltmeters requiring calibration at very high accuracy, AC-DC transfer technique will be used.
Calibration charges
| Fee in HK$ | |
|---|---|
| Calibration of single range on AC voltmeter, at one frequency. |
$1560 |
| Calibration of each additional range at full range on the same AC voltmeter, at one frequency. | $170 |
| Additional linearity check at one frequency, per range. | $780 |
| Calibration at each additional frequency :
1. First range (5 test voltages). 2. Each additional range (at full range). |
$780 $170 |
| Calibration of precision AC voltmeter at one frequency/ voltage combination by AC-DC transfer. | $2470 |
| Calibration at each additional frequency/ voltage combination by AC-DC transfer, for the same equipment. | $610 |
