| Item | TOS5401 | TOS5402 | TOS5403 | ||
|---|---|---|---|---|---|
| Current judgment*1 | Function | The output is shut off when a judgment is made. Beep volume level can be set for PASS and FAIL separately. | |||
| UPPER FAIL | Judgment method | Upper limit (Upper) is detected. | |||
| Display | Shown on the display. | ||||
| Beep sound | On | ||||
| SIGNAL I/O | The U FAIL signal is generated continuously until a STOP signal is received. | ||||
| LOWER FAIL | Judgment method | Lower limit (Lower) is detected. Voltage rise time (Rise Time)Voltage fall time (Fall Time) | |||
| Display | Shown on the display. | ||||
| Beep sound | On | ||||
| SIGNAL I/O | The L-FAIL signal is generated continuously until a STOP signal is received. | ||||
| PASS | Judgment method | PASS judgment is made if Upper-FAIL or Lower-FAIL has not occurred when the test time elapses. | |||
| Display | Shown on the display. | ||||
| Beep sound | ON (fixed at 0.2 s regardless of Pass Hold setting) | ||||
| SIGNAL I/O | The PASS signal is generated for the length of time specified by the Pass Hold setting. If Pass Hold is set to Infinity, the PASS signal is generated continuously until a STOP signal is received. | ||||
| Upper limit setting range | AC: 0.01mA to 110.00mA DC: 0.01mA to 11.00mA | DC: 0.01mA to 11.00mA | |||
| Lower limit setting range | AC: 0.00mA to 109.99mA, or OFF DC: 0.00mA to 10.99mA, or OFF | DC: 0.00mA to 10.99mA, or OFF | |||
| Judgment accuracy*2 | 1.00mA ≦ i | ±(1.5% of setting) | |||
| i < 1.00mA | ±(1.5% of setting + 20 μA) | ||||
| Current detection method | Calculates the current’s true rms value or mean-value and compares this value with the reference value | ||||
| Calibration | Calibrated with the rms of a sine wave using a pure resistive load | ||||
| Discharge detection function | Function | Separately from the Upper judgment, it is possible to choose between low-pass filter (LPF) and high-pass filter (HPF) to detect a discharge at the EUT. | |||
| LPF | The judgment criterion is set to a value greater than the set Upper value. It can be switched between three levels: Fast, Medium, Slow. It is generally for normal withstanding voltage test. | ||||
| HPF | The judgment criterion is set to a fixed value independently of the set Upper value. It can be switched between three levels: High, Medium, Low. It is mainly for detecting small discharges. | ||||
*1 In the following conditions, charging current may activate a FAIL judgment or trigger the protection function. EUT capacitance: 1μF; Rise Time: 1 second or less; Judge Delay: 1.2 seconds or less.
*2 When the humidity is 70% or higher, add 50μA. During AC voltage tests, current also flows in the stray capacitance of items such as the test leads and tools. For details on stray capacitance, see “Stray Capacitance of AC Withstanding Voltage Tests”.
