PQA819 - PQA820
EN – 7
4. NOMENCLATURE
4.1. INSTRUMENT
DESCRIPTION
CAPTION:
1. Indication LEDs
2. Description of the indication LEDs
3. USB port
4. Voltage and Current inputs
5. Keyboard
Fig. 1: Instrument description
4.2. KEYBOARD
DESCRIPTION
The keyboard includes the following keys:
ON/OFF: pressing this key to switches the instrument on. Press the key approx. 2s to
switches the instrument off. If the instrument do not switch off press and hold this key
for at least 5s
START/STOP: for manually starting and stopping recording (see § 7 and 7.3).
SYSTEM: It allows for the selection of the electrical system (Single phase, Three phase 3-
wire and 4-wire)
WiFi/RF: it allows for the selection of the communication mode, WiFi or RF (only for the
communication with other HT instruments).
4.3. DESCRIPTION OF THE LED
LED Description
POWER
It describes the status and supply mode of the instrument:
Off:
instrument switched off
Flashing green:
instrument switched on supplied by internal batteries
Flashing red:
internal batteries almost flat
STATUS
It described the instrument status:
Off:
No recording in progress
Flashing green:
Recording in progress
Green:
Instrument waiting to start recording. Recording will always start at
the beginning of the minute after the START button has been pressed
/ receipt of the start recording control
Flashing red: Memory
full
Red:
Internal error – use the management software to identify the type of
malfunction. Some of them may also prevent recording.
RF/WiFi
It described what communication mode is currently set in the instrument:
Off: WiFi
mode
Flashing green:
RF mode (only for connection with other HT instruments)
CONNECTION It indicates if a WiFi or RF connection is active (according to the communication mode set)
SYSTEM
It indicates the electrical system currently set:
Off: Single-phase
mode
Flashing green:
Three-phase without neutral mode
Green:
Three-phase with neutral mode
ERROR
It indicates possible connection errors:
Off:
No error detected
Flashing red:
Phase sequence incorrect
Red:
One of the active powers measured by the instrument is negative.
Table 2: Description of LEDs
