PerkinElmer Photovac 2020, Manual

Page: 64 / 190

2020 Software Manual
62
Mode
The Mode function is used to select the display type. You can select
TWA, STEL, MAX, and PEAK.
To select the operating mode:
1. Press the ENTER key.
2. Select “Disp” and then press “Mode”. Select the mode
you want to view. The current mode is not assigned a
soft key.
For example, if the current mode is TWA, then when
you press the “Mode” key, “PEAK”, “STEL” and
“MAX” will be displayed.
When you have selected the new display mode, the meter display
and status display will be updated to reflect the new mode. See
STEL, TWA, MAX and PEAK Operation on page 46 for a detailed
description of each mode.
Lock
The “Lock” key is used to prevent access to 2020’s sensitive
options. Sensitive options are those which can affect 2020’s
readings. These include selecting a calibration memory, zeroing the
instrument and spanning the instrument. If any one of these
functions are selected when the instrument is locked, 2020 will
prompt you to unlock the instrument before you can access the
functions.
To lock 2020:
1. Press the ENTER key. Press “Disp” and then select
“Lock”.
2. You will be prompted for a password. If no password
has been entered, then press the ENTER key. If a