Best suited for measurement of contact resistance such as relay, switch, and connector and internal resistance of battery, condenser
● Low test current
● Minimum resolution:10μΩ
● Maximum measurement range：199.9Ω
● Measurement signal：1kHz
● 4-terminal measurement
● Built-in Contact check
● By either GP-IB or RS-232C, all the functions are remote-controllable (Option)
● Analog output measured value：DC0～1.999V
Specifications
Measuring range and Accuracy (at23℃±5℃)
| Range | Measurement range | Resolution | Measured current | Accuracy（SLOW） | Accuracy（FAST） |
|---|---|---|---|---|---|
| 20mΩ | 0.00～19.99mΩ | 10μΩ | 5mA | ±（0.5％＋2digit） | ±（0.5％＋5digit） |
| 200mΩ | 0.0～199.9mΩ | 100μΩ | 500μA | ±（0.3％＋2digit） | ±（0.3％＋3digit） |
| 2Ω | 0.000～1.999Ω | 1mΩ | 50μA | ±（0.2％＋1digit） | ±（0.2％＋2digit） |
| 20Ω | 0.00～19.99Ω | 10mΩ | 50μA | ||
| 200Ω | 0.0～199.9Ω | 100mΩ | 5μA |
| Test signal | 1kHz±0.1％ sine wave/less than 20mV |
|---|---|
| Measuring method | 4-terminal measurement [contact check] |
| Sampling time | FAST：40msec. (approx.)/SLOW：140msec. (approx.) |
| [In case of measurement with contact check function, measuring time is longer by about 5 msec.] |
|
| Zero compensation | 50 counts in each range for both |
| Measuring terminals DC max. voltage | DC 50V |
| Range changeover | Auto Manual (20mΩ～200Ω) |
| Indication of comparator’s comparison result | LED indication LO/GO/HI and buzzer |
| Control signal | Remote start signal |
| Remote hold signal | |
| comparison output [LO/GO/HI]：open collector | |
| contact error output [CONT-E]：open collector | |
| end of comparison output [EOC]：open collector | |
| Operation condition | [Temp.] ＋5℃～＋40℃ [Humidity] less than 85％ |
| Power supply | AC100V/117V/220V/240V switchable, 50/60Hz, less than 50VA |
| Outer dimension | about 250 (W) ×99 (H) ×300 (D) mm (excluding protruding parts such as rubber legs, etc.) |
| Weight | about 4.3kg |
The Outline
High speed digital 1kHz mΩ Meter, Model AX-125A is capable of measuring very low resistance by alternative current signal of 1kHz in high speed.
The measured value is compared with the set value by a built-in digital comparator and the comparison result is indicated by LO, GO, HI display and a buzzer, and output by open collector.
The instrument is suitable for contact resistance measurement of relay,switches, connectors, etc., internal resistance measurement of batteries, E.S.R. measurement of capacitor, and resistance of temperature transducer.
As the synchronous detecting method is applied, the instrument measured the pure resistance only even when series inductance exists.
Because only less than 20mV peak voltage is impressed even when the terminals are opened, destroy of oxidized membrane can be avoided.