The default reference impedance is 600Ω but a different value can be selected by entering the
edit mode. With dB already selected press EDIT; the main display will now show rEF and the
current impedances will be shown in the secondary display. Use the Range Up/Range Down keys
to scroll through the list of impedances which can be set:
50, 75, 93, 110, 124, 125, 135, 150, 250, 300, 500, 600, 900, 1000, 1200, and 8000Ω. Pressing
Clr, the edit function of Cancel, enters the default value of 600Ω. To exit edit mode saving the new
reference impedance press Run or dB; to exit edit mode without changing the value (i.e. the
previous value is restored) press Esc.
Hold can be used with dB mode, but selecting any other function will cancel dB; pressing dB
again will also cancel it.
Second Level Modifiers
Second level modifiers are mutually exclusive; selecting a second level modifier cancels any
previous one. Selecting a second level modifier cancels Dual Measurement Mode. Pressing
Cancel, or changing the function or range, will cancel the modifier but the parameter values are
saved.
Selection and Editing
All modifiers are selected by pressing the FUNCTION key. The first press shows all the available
modifiers as a ‘menu’ with the last-selected one flashing. Subsequent presses of FUNCTION
make each modifier flash in turn; the current selection is the flashing one.
To run the selected modifier press Run at this point; the flashing modifier symbol is now static and
all the other modifiers annunciators are off. When running, the modified value appears on the
secondary display; the main display continues to show the un-modified value. Pressing Cancel
during modifier selection, or while a modifier is running, cancels the modifier and returns the
meter to single measurement mode.
To edit the parameters of a secondary modifier press Edit when the required modifier is either
selected (i.e. flashing) in the menu or is already running; the annunciator flashes with all other
modifier symbols off. During editing the name of the modifier parameter is shown in the main
display (e.g. A for Ax + b, HI for High Limit, etc.) and the parameter value is shown in the
secondary display. The digits of this number are incremented and selected using the Change
Digit, Step Digit and +/- keys as described earlier in the Number Editing section. Pressing Clr, the
edit function of Cancel enters the default value of the parameter; pressing Copy rdg, the edit
function of Null, enters the current meter reading as the parameter value when this is permitted.
When editing is complete, pressing Edit again will save the parameter and display the next one to
be edited, if there is more than one. Pressing Run exits edit mode, saving the parameters, and
runs the modifier. Pressing Esc exits edit mode without saving any new parameters (the previous
ones are restored) and exits the modifier. Pressing FUNCTION exits edit mode, saving the
parameters, and returns to the modifier ‘menu’.
Delta %
The Delta % function displays, in the secondary display, the percentage deviation of the current
measurement from a reference value; the main display shows the normal reading.
Delta % = Reading - Reference
%
Reference
The Delta % maximum display is ±999.99% and the resolution is fixed at 0.01%. The display
shows - Or - if the maximum is exceeded.
To select Delta % press the FUNCTION key until the Delta % symbol flashes in the menu of
modifiers. Pressing Edit will then permit the reference to be set as described earlier in the
Number Editing section; during edit the main display shows rEF. The reference value is a number
variable over the range ±00000 to ±99999; the decimal point position is set by the range in use
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