• Auto range mode
  When the display data increases more than 20,000/200,000, the range is automatically changed (increased), whereas when the display data goes down to less than 1,800/18,000, the range is automatically changed (decreased).
• Manual range mode
  If the measuring range exceeds upper-limit setpoint, -oL- (overload) is displayed.

• Auto mode (AUTO)
  Data is sampled at a preset integral time and measuring intervals.
• Single mode (SINGLE)
  One datum is sampled at the preset integral time every time a trigger signal is generated.
• N-Reading mode (N RDGS) Data are sampled in the cycles set by the integral time and measuring intervals.

The following three ways are available for generating trigger signals.

• Press the TRIG key on the front panel.
• Input a contact signal or TTL logic signal to the I/O signal connector (pin No. 1).
• Send the "E" or GET command through GP-IB or RS-232-C. In STORE mode, triggering performs three types of operations according to measurement modes as follows:
• In AUTO mode, data are written leaving NS-1 data before generating trigger signals and the STORE mode is automatically turned OFF when memory capacity is full. Amounts of data that are written depend on the built-in memory or IC card memory. (Pre-Trigger Function)
• In SINGLE mode, sampled data is stored every time a trigger signal is generated.
  If NS data that are preset are stored, STORE mode is automatically turned OFF. (Preset Counter Function)
• In N RDGS mode, each NS data is stored every time a trigger signal is generated.

STORE mode is in halt status until the next trigger signal is generated. The STORE mode is automatically turned OFF when memory capacity is full. In RECALL mode, data are recalled whenever a trigger signal is generated according to measurement mode. In AUTO mode, data are automatically recalled at measurement intervals which have been set at the time of recall.

The time interval between a trigger signal generation and the sampling can be set from 0 to 60 minutes. This allows accurate measurements when a signal source has dead-time or the measurement circuit shows a first-order lag response.

Y = X - X₀
Where;
X₀?: initially set value (NULL value)
Y : computed value
X : measured value

Reset an initially set value (data being displayed) to zero as NULL value. Thereafter a value subtracted by a NULL value is displayed as a measured value. This null function is used to eliminate leadwire resistance or cancel initial values.

The AVG function is used to average the measured data. This comes into effect when noise components or variation of measured data at high-speed sampling must be eliminated from the measured value. The calculation expression is given by:

Y = (X_AT?+ X_AT-1 + .... + X₁) / AT where
AT : 2 to 100 (number of average data)
X : measured value
Y : computed value

The scaling function serves not only to indicate a multiple with preset multiplying factors but also to determine deviation from a preset reference value.

The comparator function compares a measured value (or null or averaging values) with the reference value to determine which value is larger or smaller if the measured value is within the limits.