Hach-Lange TITRALAB 840_845 Reference Manual - Manual (Page 193)

Titra Lab ® TitraLab 840 and 845 Reference Manual
Page 193
TTL IN
(sockets) Red and black banana sockets (diameter = 2 mm).
The auxiliary input socket can be connected to an external device unit
used to send a titration start command . The red banana socket
receives a signal TTL 0 ±5 V and the black banana socket is
connected to the instrument electrical zero.
Specifications (potential difference is given in absolute value)
Input signal
Level 0: 0 to 0.8 V
Level 1: higher than 2 V and equal to or less than 5 V
Input impedance: 10 KOhm
The auxiliary input signal is programmed in the Configuration menu,
see "Auxiliary input", page 41 .
A TTL 0-level does not mean a 0 V output. The voltage
difference varies from 0 to ±400 mV.
Turntable
blocked (SAC
error) The turntable has been blocked or forced and or cannot function
properly.
Remove the obstruction and press Resume analysis (key 1) to
continue the sequence from the point it stopped.
Warning!
Do not change the turntable before restarting the sequence from the
beaker it stopped (key 1) or before restarting the sequence from the
next beaker (key 2). The sample changer identifies a turntable only
when a new sequence is initialized (equivalent to a keystroke on 3
End of sequence followed by 1 Run sequence).
Type of method The type of method is selected in the Add method menu while editing
a sequence. The following types are available:
• Sample only methods,
• Electrode calibration methods,
• Reagent calibration methods,
• Blank sample methods (Yes has been selected for Blank in the Edit
method menu).