Yokogawa AC8 Calibration Units - Manual (Page 11)

11
IM 11M6D2-02E-A
Cal start in
Chan 1 Span CAL
CAL time
Chan 1 Zero CAL
CAL time
Chan 1output hold
Stabilization
Chan 1 output hold
Chan 2 Span CAL
CAL time
Chan2 Zero Cal
CAL time
Chan 2 output hold
Stabilization
Chan 2 output hold
Average output
SV-Chan 1 contact off on
SV- Chan 2 contact off on
SV- Chan 2 contact span gas on zero gas on span gas on zero gas on
Chan 2 removed from average Chan 1 removed from average
CAL start
Figure 7.3
If the mode is [Auto]:
In addition to the above [Hold] output stabilization (settling)
time [Cal. Time] setting, there is also Cal. [Interval], [Start
date] and [Start time]. The Automatic Calibration Interval can
be set in the range 00 days 00 hrs to 255 days 23 hrs once
Auto Calibration starts. It is performed for all installed chan-
nels, so the interval needs to be larger than the sum of span
and zero calibration times plus settling tines for all channels.
The Start date and Start time are for the first calibration in
the Auto Calibration cycle (repeated at the calibration inter-
val). To set 2004 June 21 at 1:30 pm, set Start date to:
YY: 04, MM: 06, DD: 21 and Start time to HH: 13, MM: 30.
1) From the [Calibration Setup] display, select [Timing] and
the display shown in Figure 7.4 appears. In this example,
[Mode] is set to [Auto].
2) Select items and enter numerical values as required.
Figure 7.4 Calibration time setting
NOTE
When setting, keep the following points in mind:
1) When calibration is to be started by a contact input signal,
the contact input signal on the [Input Contacts] display
needs to be defined and enabled.
2) The starting of Auto Calibration may be delayed by the
status of the channel to be calibrated, or by the status of
other channels, as explained by table 7.1.